The cam sensor is located on the opposite side of the engine.
If you did not disturb this I doubt it is a problem.
This started right after a belt replacement for maintenance. Not from breaking.
The cam gears were not loosened.
The engine runs, not great, but runs.
This points to being off one tooth.
It can be difficult to tell. Sometimes the marks will want to line up with the gear between teeth. You then have to use your best judgment to determine which way to go. If this was the case with your engine, you may want to adjust it the opposite way.
I did not see any pictures.
I know how frustrating things like this can be.
It is best to take a step back and take a deep breath.
I would give one more try. If still having problems I would take it in just to relive the stress.
I do not get this pleasure. I am stuck with something like this until I get it fixed.